Improvement in paper-calendering machines



(408.) 2 Sheets-Sheet STEPHEN MOORE.

` Calendern Machines. llnrooyemem m Paper Igatentet! Dec.12,871.

(108;) 2 Sheets--Shoet 2.

STEPHEN MOORE. I

Improvement in Paper Calenderng Machines.

No. 121,800. Patented 0120.12, 1811,v

www. 6% y WML l @v/94 w UNITED STATES PATENT OFFICE STEPHEN MOORE, OF SUDBURY, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND HOMER ROGERS, OF SAME PLACE.

IMPROVEMENT IN PAPER-CALENDERING MACHINES.

Specification forming part of Letters Patent No. 121,800, dated December 12, 1871.

To all whom it may concern:

Beit known that I, STEPHEN MOORE, of Sudbury, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Oalendering-Machines; and I do hereby declare that the following', taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention sufficient to enable those skilled in the art to praetice it.

My invention relates to an improvement in calendering pasteboard, card-board, leather board, and other thick coarse paper. The invention consists in combining with a pair of calenderi n g-rolls a straight-edge or gauge-bar hung in a treadleframe, said frame having a spring which holds the bar normally away from the lower roll so as to leave a free entrance for the board to and between the rolls, depression of the treadle after the edge of the board has been entered between the rolls pressing the bar upon the board and to the surface of the lower roll, and acting as a straightener to remove the wrinkles from the board prior to the bite and calendering action of the rolls upon it, thereby preventing the wrinkles from being calendered into the surface of the board.

In operating these machines for calendering pasteboard and similar stock two attendants are generally necessary, one to feed the stock into the machine and another to take the calendered stock and hand it back to the first, that he may again run through if not sufficiently calendered, the back of the machine not being accessible to the feeder-in at the front of the machine for him to take the calendered stock.

In my construction I combine with the rolls guides, so arranged as to lead the calendered board from the rolls up and back over the top roll into position to be taken by the feeder-in, thereby obviating the necessity of a second attendant. This improvement constitutes another feature of my invention. l

The drawing represents, at A, B, and O, respectively, a front elevation, a rear elevation, and a vertical cross-section of a machine embodying the invention.

a b denote two housing-stands, having` suitable boxes or bearings, in which are journaled the shafts of two calender-rolls, c d, the lower bearings being stationary and the upper ones movable, the latter being forced down by the stress of suitable springs having their pressure adj ustably regula-ted by suitable screws. In front of the rolls c d is a bar, f, extending from two opposite arms, g g, each of which is pivoted, as seen at h, these two arms being connected, by rods z' i, with a treadle-bar, k, which is fixed to the front ends of two arms, l l, each pivoted, as seen at m. Suitable springs a raise the arms g g and normally hold the bar f up so as to leave an open and free space between the bottom of the bar and the surface ofthe lower roll, into which space the front edge of the board to be rolled is entered to bring it between Iand to the bite ofthe rolls. The under surface of this bar is preferably made concave to conform and fit to the surface of the roll, and by forcing down the treadle the bar f is forced down to the roll (l.

In operating the machine the edge of the board Jv is passed under the bar f and between the rolls, and as the rolls begin to bite upon it the bar is forced down by the treadle hard against the board, and as the bar is then practically stationary with respect to the rolls, it acts as a gauge or throatpiece to remove all wrinkles or obstructions from the board, taking out the wrinkles instead of crushing them; the subsequent action of the rolls then calenderiug a uniform surface instead of a surface more or less wrinkled, which wrinkles, but for the bar, would have more or less pressed into the surface of the board. As the bar is normally held away from the roll it may be brought into action by the operator in accordance with the quality of the board; or, in other words, the bar is brought against the board as the condition ofthe surface thereof may render desirable. When the calendered edge emerges from the rolls it strikes upon the ends or points of guide-fingers o, (which extend in between the rolls almostto their plane of contact,) these fingers extending up and partially around the upper roll, as seen at B and C, the upper ends being fastened upon a cross-bar or rod, p. As the board is pressed forward these ngers guide the edge, so that it runs up and partially over the roll, as seen at C, thus reaching a position wh ere it can be readily seized by the attendant who presented it to the rolls, he then reintroducingit, if necessary, or laying it on one side if sufficiently calendered.

l claimendured .sheet to or toward the front el' the ninl Chine7 substantially als shown und described.

llxeented the 2d dzLy 0f September, A. 1). 1871.

STEPHEN HOORN.

\\'itnesses:

Il. H. GUUDNOUGH,

lNJ. H. RICHARDSON. (10S) 

